Do Speakers need to be magnetically shielded?

Do Speakers need to be magnetically shielded?

As HDTV technology (LED, LCD, Plasma and DLP) is the new standard, magnetic shielding is no longer required. Magnetic shielding was added to speakers in the past to prevent damage to Cathode Ray Tube (CRT) Televisions which are not recommended for use with unshielded speakers.

How does a magnetic speaker work?

Speakers have two magnets. When current passes through the coil of wire, the electromagnet becomes magnetized and gets pulled and then pushed away from the permanent magnet. The cone is attached to the electromagnet, so when the electromagnet moves, the cone vibrates, creating sound (which is just moving air).

How does a magnetic shield work?

When using a high permeability shielding enclosure to protect electrical components in the presence of a magnetic field, the shield works by diverting the magnetic flux and drawing the magnetic field lines into the shielding material rather than them passing into the protected space.

What is a magnetically shielded speaker?

Shielded speaker drivers have a housing around the voice coil assembly. It’s generally known that speakers, especially large ones, have huge magnets inside of them that drive the movement of a speaker’s cones. And it’s generally believed that having powerful magnets next to computer gear can be a recipe for disaster.

How do you tell if a speaker is magnetically shielded?

If you can see the drivers somehow, shielded speakers will have a can over the magnet, or a second magnet glued attatched onto the back of the first. And ‘shielded’ is a bit of a misnomer. ‘Reduced stray field’ is more accurrate. Even shielded speakers put out a bit of mojo.

Are magnets bad for speakers?

The filings trace lines of magnetic force. Hence, a powerful magnet near your speaker is going to distort the lines of force and distort the sound. Keep your magnet away and the speaker should be fine, unless you are keeping very powerful magnets around the house.

How does a permanent magnet work in a speaker?

Inside a speaker, the voice coil is connected to the cone and placed in front of a permanent magnet which is fixed in position. The cone amplifies the vibrations created by the movement of the voice coil pushing sound waves out of the speaker and into the surrounding air.

What is the main idea behind MAD’s?

Mutual assured destruction (MAD) is a doctrine of military strategy and national security policy in which a full-scale use of nuclear weapons by two or more opposing sides would cause the complete annihilation of both the attacker and the defender (see pre-emptive nuclear strike and second strike).

How can a speaker block a magnetic field?

Purchase the shield material. Common steel items like pipe-caps for air ducts or electrical steel junction boxes will do the job nicely. Best of all, you can find them at any hardware store. Special products may be purchased which are designed especially to shield speaker magnets.